Observation of low-depolarization contrails at Florence (Italy) using a 532-1064 nm polarization LIDAR

Details Observation of low-depolarization contrails at Florence (Italy) using a 532-1064 nm polarization LIDAR Observation of low-depolarization contrails at Florence (Italy) using a 532-1064 nm polarization LIDAR

Nov 2001

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001georl..28.4067d&link_type=abstract

Geophysical Research Letters, Volume 28, Issue 21, p. 4067-4070

Physics

4

Atmospheric Composition And Structure: Aerosols And Particles, Atmospheric Composition And Structure: Cloud Physics And Chemistry, Atmospheric Composition And Structure: Pollution-Urban And Regional, Electromagnetics: Scattering And Diffraction

Scientific paper

Contrail backscatter and polarization measurements made using a 532-1064 nm LIDAR in Florence (Italy) indicated that, in most of the cases, the contrail depolarization and color ratio resemble the usual cirrus. In 20% of the cases, a depolarisation below 15% was observed, both in isolated contrails and in cirrus-embedded contrails. In a few cases, a very low depolarisation, down to 3%, was observed at temperatures in the -40° to -65° C range. In two measurements, a low depolarization was coupled with a high color ratio in the 2-4 range. The low-depolarisation, high color ratio contrail observations are discussed in the light of the results of recent T-matrix scattering simulations. The two events lasted at least 10-20 minutes in the LIDAR data, suggesting a very slow growth or no growth at all of the initial micron-sized contrail particles in the large ice crystals typical of cirrus.

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